原标题：ST STM32F303低功耗ARM Cortex-M4 32位MCU开发方案

　　ST公司的STM32F303xB/STM32F303xC系列是基于高性能ARM® Cortex®-M4 32位 RISC内核,其工作频率高达72MHz,器件嵌入了浮点单元(FPU),存储器保护单元(MPU)和嵌入式追踪宏单元(ETM),适用于数字功率,声纳,电机控制,照明和无线充电器等控制敏感应用.本文介绍了STM32F303xB/STM32F303xC主要特性,功能框图, STM32F3DISCOVERY 主要特性,硬件框图,电路图,材料清单,PCB设计文件.

　　The STM32F303xB/STM32F303xC family is based on the high-performance ARM® Cortex®-M4 32-bit RISC core with FPU operating at a frequency of up to 72 MHz, and embedding a floating point unit (FPU), a memory protection unit (MPU) and an embedded trace macrocell (ETM). The family incorporates high-speed embedded memories (up to 256 Kbytes of Flash memory, up to 40 Kbytes of SRAM) and an extensive range of enhanced I/Os and peripherals connected to two APB buses.

　　The devices offer up to four fast 12-bit ADCs (5 Msps), seven comparators, four operational amplifiers, up to two DAC channels, a low-power RTC, up to five general-purpose 16-bit timers, one general-purpose 32-bit timer, and two timers dedicated to motor control. They also feature standard and advanced communication interfaces: up to two I2Cs, up to three SPIs (two SPIs are with multiplexed full-duplex I2Ss), three USARTs, up to two UARTs, CAN and USB. To achieve audio class accuracy, the I2S peripherals can be clocked via an external PLL.

　　The STM32F303xB/STM32F303xC family operates in the -40 to +85 ℃ and -40 to +105 ℃ temperature ranges from a 2.0 to 3.6 V power supply. A comprehensive set of power-saving mode allows the design of low-power applications.

　　The STM32F303xB/STM32F303xC family offers devices in three packages ranging from 48 pins to 100 pins.

　　STM32F303xB/STM32F303xC主要特性:

　　• Core: ARM® Cortex®-M4 32-bit CPU with FPU (72 MHz max), single-cycle multiplication and HW division, 90 DMIPS (from CCM), DSP instruction and MPU (memory protection unit)

　　• Operating conditions:

　　– VDD, VDDA voltage range: 2.0 V to 3.6 V

　　• Memories

　　– 128 to 256 Kbytes of Flash memory

　　– Up to 40 Kbytes of SRAM, with HW parity check implemented on the first 16 Kbytes.

　　– Routine booster: 8 Kbytes of SRAM on instruction and data bus, with HW parity check (CCM)

　　• CRC calculation unit

　　• Reset and supply management

　　– Power-on/Power-down reset (POR/PDR)

　　– Programmable voltage detector (PVD)

　　– Low-power modes: Sleep, Stop and Standby

　　– VBAT supply for RTC and backup registers

　　• Clock management

　　– 4 to 32 MHz crystal oscillator

　　– 32 kHz oscillator for RTC with calibration

　　– Internal 8 MHz RC with x 16 PLL option

　　– Internal 40 kHz oscillator

　　• Up to 87 fast I/Os

　　– All mappable on external interrupt vectors

　　– Several 5 V-tolerant

　　• Interconnect matrix

　　• 12-channel DMA controller

　　• Four ADCs 0.20 μS (up to 39 channels) with selectable resolution of 12/10/8/6 bits, 0 to 3.6 V conversion range, single ended/differential input, separate analog supply from 2 to 3.6 V

　　• Two 12-bit DAC channels with analog supply from 2.4 to 3.6 V

　　• Seven fast rail-to-rail analog comparators with analog supply from 2 to 3.6 V

　　• Four operational amplifiers that can be used in PGA mode, all terminals accessible with analog supply from 2.4 to 3.6 V

　　• Up to 24 capacitive sensing channels supporting touchkey, linear and rotary touch sensors

　　• Up to 13 timers

　　– One 32-bit timer and two 16-bit timers with up to 4 IC/OC/PWM or pulse counter and quadrature (incremental) encoder input

　　– Two 16-bit 6-channel advanced-control timers, with up to 6 PWM channels, deadtime generation and emergency stop – One 16-bit timer with 2 IC/OCs, 1 OCN/PWM, deadtime generation and emergency stop – Two 16-bit timers with IC/OC/OCN/PWM, deadtime generation and emergency stop

　　– Two watchdog timers (independent, window)

　　– SysTick timer: 24-bit downcounter

　　– Two 16-bit basic timers to drive the DAC

　　• Calendar RTC with Alarm, periodic wakeup from Stop/Standby

　　• Communication interfaces

　　– CAN interface (2.0B Active)

　　– Two I2C Fast mode plus (1 Mbit/s) with 20 mA current sink, SMBus/PMBus, wakeup from STOP

　　– Up to five USART/UARTs (ISO 7816 interface, LIN, IrDA, modem control)

　　– Up to three SPIs, two with multiplexed half/full duplex I2S interface, 4 to 16 programmable bit frames – USB 2.0 full speed interface

　　– Infrared transmitter

　　• Serial wire debug, Cortex®-M4 with FPU ETM, JTAG

　　• 96-bit unique ID

　　图1. STM32F303xB/STM32F303xC框图

　　STM32F3DISCOVERY: STM32F303xx MCU Discovery kit

　　The STM32F3DISCOVERY is designed to help you explore the features of the STM32 F3 32-bit ARM® Cortex™-M4 mixed-signal MCU, and develop your applications. It is based on an STM32F303VCT6 and includes an ST-LINK/V2 embedded debug tool interface, Gyroscope ST MEMS, E-compass with accelerometer ST MEMS, LEDs, pushbuttons and a USB mini-B connector.

　　T STM32F3DISCOVERY 主要特性:

　　● STM32F303VCT6 microcontroller featuring 256 KB of Flash memory, 48 KB of RAM in an LQFP100 package.

　　● On-board ST-LINK/V2 with selection mode switch to use the kit as a standalone ST-LINK/V2 (with SWD connector for programming and debugging).

　　● Board power supply: through the USB bus or from an external 3 V or 5 V supply voltage.

　　● External application power supply: 3 V and 5 V.

　　● L3GD20, ST MEMS motion sensor, 3-axis digital output gyroscope.

　　● LSM303DLHC, ST MEMS system-in-package featuring a 3D digital linear acceleration sensor and a 3D digital magnetic sensor.

　　● Ten LEDs:

　　– LD1 (red) for 3.3 V power-on.

　　– LD2 (red/green) for USB communication.

　　– Eight user LEDs, LD3/10 (red), LD4/9 (blue), LD5/8 (orange) and LD6/7 (green).

　　● Two pushbuttons (user and reset).

　　● USB USER with Mini-B connector.

　　● Extension header for LQFP100 I/Os for quick connection to prototyping board and easy probing.

　　图2. STM32F3DISCOVERY外形图

　　图3. STM32F3DISCOVERY硬件框图